George p



(No Model.)

G. F. LOGKWOOD.

- INSULATED GEAR WHEEL.

Patented May 17, 1892.

INVENTOR BY W ATTORNEY UNITED STATES PATENT OFFICE.

GEORGE F. LOCKWOOD, OF SAGINAIV, MICHIGAN, ASSIGNOR OF ONE-HALF TO JOHNF. BARROI VS, OF SAME PLACE.

INSULATED G EAR-WHEEL.

SPECIFICATION forming part of Letters Patent NO. 474,913, dated May 17,1892.

Application filed December 10, 1891. Serial No. 414.598. (N model.)

To all whom it may concern: slid upon the nave. It maybe madein layersBeitknown that I,GEORGEF.LOCKWOOD,a or in one mass. Then the rim 4 ispressed citizen of the United States, residing at Sagiupon theinsulation of the lugs 4'4 in the coro naw, in the county of Saginaw andState of responding grooves. 5 Michigan, have invented a certain new and5 is a circular plate of same size as plate 2 useful InsulatedGear-WVheel; andIdo declare and adapted to screw on the threaded end ofthe following to be a full, clear, and exact de the nave and pressagainst the insulation 3 soription of the invention,such as will enableand hold it in its place. After it has been others skilled in the art towhich it appertains thoroughly screwed down the pin 7 is put 1n,

[0 to make and use thesame, referencebeing had passing through the plate5 into the insulato the accompanying drawings, and to the fig tion 3,and serves to keep the plate 5 from ures of reference marked thereon,which form unscrewing. a part of this specification. I do not wish toconfine myself to any spe- My invention relates to insulated gearingcial form of mechanicalconstruction, andany 15 usedin cars propelled byelectricity or to any change may be made within ordinary memachine usinggearing run by electricity. Its chanical skill without departing fromthe object is to provide a gear-wheel that is duprinciple of myinvention.

rable and at the same time be a perfect insu- Having thus describedmyinvention, what I lator. claim as new, and desire to secure by Letterszo Figure l is a sectional end view of the rim. Patent, is

Fig. 2 is a sectional end view of the nave. Fig. 1. In an insulatedgear-wheel, the combina- 3 represents the insulation. Fig. 4isatranstion, with a metal nave having longitudinal verse sectional viewof the complete wheel. transverse lugs and the metal rim having lon- 0In the drawings, 1 is the nave of the geargitudinal transverse lugs uponits inner cir- 25 wheel, made in the usual form and having cumference,ofa non-conducting material becast to one end thereof the circular plate 2tween and separating the rim and nave and and upon its outer surface oneor more longiprovided with grooves for engaging the lugs tudinaltransverse lugs 1' 1. Screw-threads on the rim and nave, and platessecured to are formed upon the other end of the nave. 4 the endsof thenave for holding the non-con- 0 is the rim of the wheel, having gearingupon ducting material in place, said plates being its engaging-surface.Between the rim4 and separated from the rim by the non-conductthe nave 1is non-conducting material or ining material, substantially asdescribed.

'sulation 3, having grooves that fit upon the 2. An insulated gear-Wheelconsisting of lugs 1' 1' of the nave. The rim 4 has upon the metal nave1, having lugs 1' 1" and a 5 its inner surface one or more transverselugs plate 2 cast to one end thereof, the other end 4 4, fitting intocorresponding grooves in the screw-threaded, the non-conductor 3, themetal non-conductor The diameter of the plates rim 4, having lugs 4 4',the plate 5, screwing is about one-half inch larger than the inside uponthe threaded end of the nave, and the diameter of the rim. 6 6 areprojecting cirpin 7, passing through the plate 5 into the 0 cumferentialedges of the insulation, and are non-conductor, substantially asdescribed.

for the purpose of separating the plates 2 and In testimony whereof Iaffix my signature in 5 from the metal rim 4. In the drawingsI havepresence of two Witnesses. these edges set into grooves at the edge ofthe inner surface of the rim, but of larger diam- GEORGE LOCKWOOD' 45eter than the plates so as to separate them Witnesses:

from the rim. The insulation 3 is formed J. F. BARROWS, with the groovesheretofore mentioned and A. H. SWARTHOUT.

